Look for 2 adults on the nest. The adult pair will show pair bonding behaviors such as vocalizations, aerial sky dances, and the male feeding the female fish. You may see the pair copulating, which typically begins 14 days before laying eggs.
Females will lay 1 - 4 eggs at a rate of one egg every 1 - 2 days. After laying, incubation starts. Look for adults taking turns sitting low in the nest incubating eggs. The incubation period can last 35 - 43 days.
Chicks hatch ~39 days after incubation begins. Look for adults bringing food to the nest and making "head bows" into the center. Chicks typically can't be seen until they are 2 - 3 weeks old, so feeding behavior is the only way to know chicks are there.
Around 4 weeks after hatching, look for the heads of chicks to show over the rim of the nest, particularly when adults bring food to the nest. Other times they lie flat and are harder to see. Count the number of chicks in the nest before they learn to fly
Chicks begin flying around 7 - 8 weeks old, and are still fed by the adults. Count the number of chicks who have successfully fledged the nest and are observed flying.
Chick Last Observed
4 - 10 weeks after fledging, chicks begin leaving the nest area to migrate south, once they have learned to fly and feed themselves. Record the date that the last chick left the nest.
Look for signs of nest failure like adult abandonment, adults no longer incubating eggs or feeding young.
Nest completely gone..? Platform is still there, but there are no sticks, branches or anything remaining. Completely different from last observation date. However, an osprey was sighted on the light pole to the left of this nest...
No sign of an osprey in or around the nest, but there are smaller birds perched along the rim of this nest. There is a male osprey perched on a light structure about 20 meters from nest, in the same field.
There are both adult osprey present during the observation period. They are tending to the nestling in the center. When the nestling perched on the edge it appeared quite large, perhaps it hatched a while before it was observed..
Both the adult male and female osprey were present, tending to the center of the nest upon arrival. After ten minutes it was evident there was a chick in the center of the nest. Soon after the male osprey moved to the lights underneath the nest.
Wow!!! After weeks of appearing abandoned this nest has been occupied! At first a very large osprey was observed perched in the front-center of the nest, grooming itself. After about 5-10 minutes the large osprey took flight and the head of an adult female was visible in the center of the nest. There appeared to be movement in the nest but perhaps it was the female shuffling around.